HT81003/HT81R03
8
July 24, 2000
Preliminary
6Hz/6HzB flash
When voices are playing, the FLAG1 pin
outputs a 6Hz signal to drive a LED. The
signal is active low, 25% duty. Once the voice
output is terminated, the FLAG1 pin be-
comes a floating output. When the FLAG1
and the FLAG2 pins are optioned as 6HzB
and 6Hz outputs, they will alternately out-
put at a 6Hz rate.
Busy output
When a voice group is playing, the outputs of
both FLAG1 and FLAG2 are turned low, indi-
cating that the chip is busy.
In addition to the above-stated output sig-
nals, FLAG1 can also generate one of the fol-
lowing signals by code option:
End-pulse output
When the voice output is completed, the
FLAG1 pin outputs an active low pulse. The
pulse width can be programmed depending
on the customer s requirements.
The FLAG1 as well as FLAG2 pins are both
floating outputs when the chip is in the
standby state.
Volume control
The function of the volume control can be set by
mask option. A code is written in the function
table for the purpose of controlling the volume
of each section output after the volume control
function is chosen. There are two volume op-
tions, namely; full range and half range.
I/O2
The I/O2 pin is a PWM structure. It outputs
voice signals to drive a speaker through an ex-
ternal NPN transistor when the chip is active.
The OUT1 and OUT2 pins are configured as
PWM structure which can drive 8/16/32
speaker directly.
An 8050 type transistor with h
FE
150 is recom-
mended for an output driver.
0
7 @ 0 -
= + 7 ( ) $ " 6
0
7 @ 0 -
= + 7 ( ) $ " 6
0
7 @ 0 -
= + 7 ( ) $ " 6
0
7 @ 0 -
= + 7 ( ) $ " 6
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